Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 203 insertions, 0 deletions

diff --git a/storage/maria/ma_delete_all.c b/storage/maria/ma_delete_all.c
new file mode 100644
index 00000000..c1019c01
--- /dev/null
+++ b/storage/maria/ma_delete_all.c
@@ -0,0 +1,203 @@
+/* Copyright (C) 2006 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+/* Remove all rows from a MARIA table */
+/* This clears the status information and truncates files */
+
+#include "maria_def.h"
+#include "trnman.h"
+
+/**
+   @brief deletes all rows from a table
+
+   @param  info             Maria handler
+
+   @note It is important that this function does not rely on the state
+   information, as it may be called by ma_apply_undo_bulk_insert() on an
+   inconsistent table left by a crash.
+
+   @return Operation status
+     @retval 0      ok
+     @retval 1      error
+*/
+
+int maria_delete_all_rows(MARIA_HA *info)
+{
+  MARIA_SHARE *share= info->s;
+  my_bool log_record;
+  LSN lsn;
+#ifdef HAVE_MMAP
+  my_bool mmap_file= share->file_map != 0;
+#endif
+  DBUG_ENTER("maria_delete_all_rows");
+
+  if (share->options & HA_OPTION_READ_ONLY_DATA)
+  {
+    DBUG_RETURN(my_errno=EACCES);
+  }
+  /**
+     @todo LOCK take X-lock on table here.
+     When we have versioning, if some other thread is looking at this table,
+     we cannot shrink the file like this.
+  */
+  if (_ma_readinfo(info,F_WRLCK,1))
+    DBUG_RETURN(my_errno);
+  log_record= share->now_transactional && !share->temporary;
+
+  if (log_record)
+  {
+    /*
+      This record will be used by Recovery to finish the deletion if it
+      crashed. We force it to have a complete history in the log.
+    */
+    LEX_CUSTRING log_array[TRANSLOG_INTERNAL_PARTS + 1];
+    uchar log_data[FILEID_STORE_SIZE];
+    log_array[TRANSLOG_INTERNAL_PARTS + 0].str=    log_data;
+    log_array[TRANSLOG_INTERNAL_PARTS + 0].length= sizeof(log_data);
+    if (unlikely(translog_write_record(&lsn, LOGREC_REDO_DELETE_ALL,
+                                       info->trn, info, 0,
+                                       sizeof(log_array)/sizeof(log_array[0]),
+                                       log_array, log_data, NULL) ||
+                 translog_flush(lsn)))
+      goto err;
+    /*
+      If we fail in this function after this point, log and table will be
+      inconsistent.
+    */
+    if (_ma_mark_file_changed(share))
+      goto err;
+  }
+  else
+  {
+    if (_ma_mark_file_changed(share))
+      goto err;
+    /* Other branch called function below when writing log record, in hook */
+    _ma_reset_status(info);
+  }
+  /* Remove old history as the table is now empty for everyone */
+  _ma_reset_state(info);
+  share->state.changed= 0;
+
+  /*
+    If we are using delayed keys or if the user has done changes to the tables
+    since it was locked then there may be key blocks in the page cache. Or
+    there may be data blocks there. We need to throw them away or they may
+    re-enter the emptied table or another table later.
+  */
+
+#ifdef HAVE_MMAP
+  if (mmap_file)
+    _ma_unmap_file(info);
+#endif
+
+  if (_ma_flush_table_files(info, MARIA_FLUSH_DATA|MARIA_FLUSH_INDEX,
+                            FLUSH_IGNORE_CHANGED, FLUSH_IGNORE_CHANGED) ||
+      mysql_file_chsize(info->dfile.file, 0, 0, MYF(MY_WME)) ||
+      mysql_file_chsize(share->kfile.file, share->base.keystart, 0, MYF(MY_WME)))
+    goto err;
+
+  if (_ma_initialize_data_file(share, info->dfile.file))
+    goto err;
+
+  if (log_record)
+  {
+    /*
+      Because LOGREC_REDO_DELETE_ALL does not operate on pages, it has the
+      following problem:
+      delete_all; inserts (redo_insert); all pages get flushed; checkpoint:
+      the dirty pages list will be empty. In recovery, delete_all is executed,
+      but redo_insert are skipped (dirty pages list is empty).
+      To avoid this, we need to set skip_redo_lsn now, and thus need to sync
+      files.
+      Also fixes the problem of:
+      bulk insert; insert; delete_all; crash:
+      "bulk insert" is skipped (no REDOs), so if "insert" would not be skipped
+      (if we didn't update skip_redo_lsn below) then "insert" would be tried
+      and fail, saying that it sees that the first page has to be created
+      though the inserted row has rownr>0.
+    */
+    my_bool error= _ma_state_info_write(share,
+                                        MA_STATE_INFO_WRITE_DONT_MOVE_OFFSET |
+                                        MA_STATE_INFO_WRITE_LOCK) ||
+      _ma_update_state_lsns(share, lsn, trnman_get_min_trid(), FALSE, FALSE) ||
+      _ma_sync_table_files(info);
+    info->trn->rec_lsn= LSN_IMPOSSIBLE;
+    if (error)
+      goto err;
+  }
+
+  if (info->opt_flag & WRITE_CACHE_USED)
+    reinit_io_cache(&info->rec_cache, WRITE_CACHE, 0, 1, 1);
+
+  _ma_writeinfo(info, WRITEINFO_UPDATE_KEYFILE);
+#ifdef HAVE_MMAP
+  /* Map again */
+  if (mmap_file)
+    _ma_dynmap_file(info, (my_off_t) 0);
+#endif
+  DBUG_RETURN(0);
+
+err:
+  {
+    int save_errno=my_errno;
+    _ma_writeinfo(info, WRITEINFO_UPDATE_KEYFILE);
+    info->update|=HA_STATE_WRITTEN;	/* Buffer changed */
+    DBUG_RETURN(my_errno=save_errno);
+  }
+} /* maria_delete_all_rows */
+
+
+/*
+  Reset status information
+
+  SYNOPSIS
+    _ma_reset_status()
+    maria	Maria handler
+
+  DESCRIPTION
+    Resets data and index file information as if the file would be empty
+    Files are not touched.
+*/
+
+void _ma_reset_status(MARIA_HA *info)
+{
+  MARIA_SHARE *share= info->s;
+  MARIA_STATE_INFO *state= &share->state;
+  uint i;
+  DBUG_ENTER("_ma_reset_status");
+
+  state->split= 0;
+  state->state.records= state->state.del= 0;
+  state->changed=  0;                            /* File is optimized */
+  state->dellink= HA_OFFSET_ERROR;
+  state->sortkey=  (ushort) ~0;
+  state->state.key_file_length= share->base.keystart;
+  state->state.data_file_length= 0;
+  state->state.empty= state->state.key_empty= 0;
+  state->state.checksum= 0;
+  share->state.open_count= 0;
+  share->global_changed= 0;
+
+  share->changed= 1;                            /* We must write state */
+
+  *info->state= state->state;
+
+  /* Drop the delete key chain. */
+  state->key_del= HA_OFFSET_ERROR;
+  /* Clear all keys */
+  for (i=0 ; i < share->base.keys ; i++)
+    state->key_root[i]= HA_OFFSET_ERROR;
+  DBUG_VOID_RETURN;
+}